feeemah



(No Model.)

' W. P. FREEMAN.

ELECTRIC ARC LAMP.

No. 294,027. Patented Feb. 26, 1884.

UNTTEE STATES PATENT UEETCE.

XVARREN P. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO XVILLIAM F.. OBBINS, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 294,027, dated February 26, 1884.

Application filed March 9, 1883.

To a. whom it may concern:

Be it known that I, WARREN P. FREEMAN, a citizen of the United States, and a resident of Brooklyn, Kings county, New York, have invented certain Improvements in Electric- Arc Lamps, of which the following is a specification.

My invention consists of certain improve ments in the construction of that class of electrio-arc lamps in which the movable carbon is fed forward by gravity under the control of a shunt-magnet operating a retainer, and train of gear-wheels gearing into a rack on the carbon-holder, as more fully described herein- I 5 after.

In the accompanying drawings, Figure l is a side view, partlyin section, of my improved arc-regulating devices Fig. 2, a sectional plan on the line 1 2, Fig. 1; and Fig. 3, a sectional plan of a portion of the device on the line 3 4.

A is the horizontal cross-plate, which forms the upper portion of the frame of the lamp, and supports the arch B and the arc-regulat- 2 5 ing devices, as shown in Fig. 1. Through the center of this arch and through the center of the plate passes the vertical rod C, forming the holder for the positive carbon.

To one of the upright legs of the arch B are 0 bolted the electro-magnets M M, which are double-wonnd with coarse wire in the main circuit, and fine wire in a shunt-circuit, the main and shunt coils being wound so as to have opposing magnetic effects on the cores,

5 the main-circuit coils causing attraction of the armature, while the shunt-coils cause it to be repelled. A pivotblock, f, is secured to the opposite leg of the arch B by a bolt, f, so as to be adjustable in a vertical slot in the arch,

0 and to this block is pivoted the armature-lever F, carrying at its outer end the curved armature F, to be acted on by the electro-magnets M M, under the control of a spring, 9, provided with suitable adjusting devices, 9, Fig. 1.

This armature-lever is bifurcated, as shown in Fig. 2, so as to extend on both sides of the movable frame E, carrying the train of gears,

as well as the carbon-rod O. This gear-frame E may have a limited vertical movement be- 5o tween the plate A and the top of the arch, and

(.\'0 model.)

is provided with guide pins 6 e, passing through the plate and arch for that purpose. On the carbon-rod G is formed a vertical rack, D, into which gears the first wheel, (Z, of the train (1, (7 (l (F, d, (P, d, and d. The axis of this last wheel of the series carries a ratchet or break wheel, D, preferably outside of the frame E, and an arm or catch,G, carried wholly by the armatnrelever F, is adapted to come into contact with this wheel, to retain the latter and the gear-wheels, and through the wheels the carbon-holder 0, except when the armaturelever is in its lowest position in contact with a stop pin or pins, 1), preferably on the frame E. Lifting pins or projectionsl are formed on the movable frame E in such a position that on the upward movement of the armaturelever, immediately after the arm G has locked the wheel, the said lever F will come into contact with the pins Z, and on the continued up ward movement will lift the frame E, and with it the rod 0, owing to the locked condition of the train of gears. The main circuit entering at one of the usual binding-posts on the frame of the lamp passes through the conductor 5, coarse-wire coils of the electro-mag nets M, and thence by the conductor 6 through the coils m of the automatic cut-out hereinafter referred to, plate A and flexible conductor 7 to the lower part of the upper carbon holder, in the usual manner, thence passing through the negative carbon frame or conductor to the exit binding-post. The shuntcircuit is through the conductor 8, finewire coils of the eleetromagnets M, conductor 9, coils m of the cutout, and conductor 10 to the exit binding-post. \Vhen no current is passing through the coils of the electro-magnets, the armature-lever F will he in its lowest position in contact with the stop p. hen thelamp is put in circuit, the current through the main-circuit coils of the electro-magnets M will cause the attraction ofthe armature and elevation of the lever F, so as to first lock the wheel D by the arm G, and then the eleva- 9 tion of the frame E by the pins Z, thereby causing the elevation of the upper carbon and formation of the are. As the current in the IOO nets, the armature and lever F will descend and allow the frame E and carbon-holder to descend until they reach the position shown in Fig. 1, and on a continued descent of the lever F the wheel D will be released from the arm G and the train of gears be free to turn, to allow the descent of the rod 0 and feeding forward of the upper carbon. The consequent increase of current in the main circuit will raise the armature and again lock the wheel The carbon-holder 0 may be raised to allow of the insertion of a fresh carbon while the rack D remains in gear with the wheel (I, owing to the pawl-and-ratchet connection r r of the pinion d with the wheel d,- but I prefer to cut asegmental slot, (1, Fig. 3, in the plate A, and a similar one in the arch B, to allow the rod 0 to be turned partially around to throw the rack D out of gear with the wheel (I, as indicated by dotted lines in Fig. 3, so that the rod can be raised free from the wheels and put into gear again at any desired point of the rack. A retaining'lever, J, pivoted to the plate A and having a handle, j, accessible on the outside, is adapted to bear against the side of the rack, as shown in Fig. 3, to keep it in gear with the wheel (I, the said lever being movable to the position indicated by dotted lines, when it is desiredto free the rack. The automatic cut-out coils m m in the main and shunt circuits, as above referred to, are arranged with poles facing each other, and between them is a pivoted armature, nfwith suitable adj ustable springs, the armature being mounted 011 an insulated base and provided with a pin, 0. A catch, 0, pivoted to but insulated from the frame, rests on this pin, and is connected through a conductor, 11, with one of the binding-posts of the lamp. An insulated contact, a, is connected through the conductor 12 with the other binding-p 0st of the lamp. The armature-springs are so adjusted that under normal working conditions of the lamp the armature will be maintained in a position to hold the catch in its raised position and out of con tact with the point a; but when the current in the shunt-circuit increases beyond a certain point, (as when the feeding devices cease to act,) the armature a will be attracted by the electro-magnet m, and the catch 0 allowed to drop, and, coming into contact with a, will complete the circuit through the conductors 11 12, and out the lamp out of circuit and lock it so.

I claim as my invention 1. The combination of the movable carb0nholder of an electric-arc lamp having a rack, with a movable frame carrying a train of gears, electro-magnets in the main and shunt circuits, an armature-lever adapted to raise the movable frame, and a catch or arm carried wholly by the said armature-lever, to lock and release the gears, substantially as set forth.

2. The combination ofthe movable carbonholder of an electric-arc lamp having a rack, with a movable frame having lifting-pins and carrying a train of gears, and ratchet or break wheel, and with electro-magnets in the main and shunt circuits, and an armature-lever carrying a catch for said ratchet or break wheel and adapted to act on the said liftingpins, all substantially as described.

3. The combination of the movable carbon holder having a rack, and the frame slotted for the passage of said holder, with a train of wheels gearing with the rack, and a retaininglever, J, as and for the purpose specified.

4. The combination of elcctro-magnets m m in the main and shunt circuits, and armature n, carrying a catch-pin, with a contact, at, and pivoted catch adapted to come in contact with the latter 011 its release by the catch-pin and conductors ll 12, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two sub scribing witnesses.

IVARREN P. FREEMAN.

Witnesses:

JAMES C. EADIE,

HUBERT HowsoN. 

